. The fungi which cause plant disease . Plant diseases; Fungi. 350 THE FUNGI WHICH CAUSE PLANT DISEASE Chrysomyxa Unger (p. 341) III. Teliospores formed of a series of superimposed cells, of which the lower are sterile, ^â ^ ^ forming flat or slightly ele- vated, orange or reddish, waxy, crusts. Germina- tion of the teliospore by a promycelium from each cell, which produces mostly four basidiospores. C. abietis (Wal.) Ung. Fig. 254.âMelampsoropsis rhododendri, section Tolio c\r\\\r Tf frirmc through telium. After De Baiy. ^^"^ °"'y- " ^"^^^ yellow spots on spruce leaves an
. The fungi which cause plant disease . Plant diseases; Fungi. 350 THE FUNGI WHICH CAUSE PLANT DISEASE Chrysomyxa Unger (p. 341) III. Teliospores formed of a series of superimposed cells, of which the lower are sterile, ^â ^ ^ forming flat or slightly ele- vated, orange or reddish, waxy, crusts. Germina- tion of the teliospore by a promycelium from each cell, which produces mostly four basidiospores. C. abietis (Wal.) Ung. Fig. 254.âMelampsoropsis rhododendri, section Tolio c\r\\\r Tf frirmc through telium. After De Baiy. ^^"^ °"'y- " ^"^^^ yellow spots on spruce leaves and the basidiospores seem able to infect the same host. European. Cronartium Fries (p. 341) O. Pycnia deep-seated, broad and flat. I (=Peridermium). iEcia erumpent, inflated. Peridium mem- branous, rupturing at the sides rather than above, 2-4 cells thick, outer surface smooth, inner verrucose. Spores ellipsoid; wall colorless, coarsely verrucose with deciduous tubercles, except a smooth spot on one side. II. Uredinia somewhat erumpent. Peridium moderately firm, rupturing above, upper part evanescent; peridial cells isodiametric. Spores borne singly on pedicels, globoid to ellipsoid; wall nearly or quite colorless, echinulate, pores obscure. III. Telia erumpent, at first arising from the uredinia, the catenulate spores adhering to form a much extended, cylindrical or filiform column, homy when dry. Spores oblong to fusiform, 1-celled; wall slightly colored, thin, smooth. Five American species are recognized by Arthur.** All known secial stages are Peridermiums on stems of conifers. C. ribicola F. de Wai.^^-^' »' O. Pycnia caulicolous, scattered, honey-yellow, forming minute, bladdery swellings. Spores hyaline, ovoid to elliptical, /*.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Stevens, Fr
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1913
